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SHI11 - H₂O Maser Motions and the Distance of the Star-Forming Region G192.16-3.84

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Short title: Shiozaki et al. (2011)
Authors: Shiozaki, SatoshiImai, HiroshiTafoya, DanielOmodaka, ToshihiroHirota, TomoyaHonma, MarekiMatsui, MakotoUeno, Yuji
Journal: Publications of the Astronomical Society of Japan, Vol.63, No.6, pp.1219-1228
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Target type: High_mass_SFR

Abstract
We present the results of astrometic observations of H2O masers associated with the star-forming region G 192.16-3.84 with the VLBI Exploration of Radio Astrometry (VERA). The H2O masers seem to be associated with two young stellar objects (YSOs) separated by ∼1200 AU, as reported in previous observations. In the present observations, we successfully detected an annual parallax of π = 0.66�0.04 mas for the H2O masers, which corresponds to a distance to G 192.16-3.84 of D = 1.52�0.08 kpc from the Sun. The determined distance is shorter than the estimated kinematic distance. Using the annual parallax and the estimated parameters of the millimeter continuum emission, we estimate the mass of the disk plus circumstellar cloud in the southern YSO to be 10.0+4.3-3.6M⊙. We also estimate the galactocentric distance and the peculiar motion of G 192.16-3.84, relative to a circular galactic rotation, to be R* 9.99 �0.08 kpc and Z* = -0.10�0.01 kpc, and (U,V,W*) = (-2.8�1.0, -10.5�0.3, 4.9�2.7) [km s-1], respectively. The peculiar motion of G 192.16-3.84 is not beyond the range of recent VLBI astrometric results. The angular distribution and three-dimensional velocity field of H2O maser features indicate the existence of a bipolar outflow with a major axis along the northeast-southwest direction.

Abstract

We present the results of astrometic observations of H2O masers associated with the star-forming region G 192.16-3.84 with the VLBI Exploration of Radio Astrometry (VERA). The H2O masers seem to be associated with two young stellar objects (YSOs) separated by ∼1200 AU, as reported in previous observations. In the present observations, we successfully detected an annual parallax of π = 0.66�0.04 mas for the H2O masers, which corresponds to a distance to G 192.16-3.84 of D = 1.52�0.08 kpc from the Sun. The determined distance is shorter than the estimated kinematic distance. Using the annual parallax and the estimated parameters of the millimeter continuum emission, we estimate the mass of the disk plus circumstellar cloud in the southern YSO to be 10.0+4.3-3.6M⊙. We also estimate the galactocentric distance and the peculiar motion of G 192.16-3.84, relative to a circular galactic rotation, to be R* 9.99 �0.08 kpc and Z* = -0.10�0.01 kpc, and (U*,V*,W*) = (-2.8�1.0, -10.5�0.3, 4.9�2.7) [km s-1], respectively. The peculiar motion of G 192.16-3.84 is not beyond the range of recent VLBI astrometric results. The angular distribution and three-dimensional velocity field of H2O maser features indicate the existence of a bipolar outflow with a major axis along the northeast-southwest direction.

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Obs. RA	Obs. Dec	RA offset	Dec offset	#	Maser spot	Source name	V_peak	μ_X	μ_Y	π
(J2000)	(J2000)	(mas)	(mas)				(km/s)	(mas/yr)	(mas/yr)	(mas)

DSS colored	2MASS colored	WISE colored
SDSS color	IRAC color I1,I2,I4	GLIMPSE 360
PACS color (70-160 um)	SPIRE color (250-500 um)	NVSS (1.4GHz)
ATLASGAL 870 um	ATLASGAL 870 um + Planck	Bolocam 1.1 mm
UKIDSS K Download UKIDSS K FITS	2MASS K Download 2MASS K FITS

select MAX(h2o_data_all.ra_hms) as ra_hms,MAX(h2o_data_all.dec_dms) as dec_dms,MAX(h2o_data_all.source_name) as source_name,MAX(h2o_data_all.ra) as ra,MAX(h2o_data_all.dec) as dec,MAX(h2o_data_all.l) as l,MAX(h2o_data_all.b) as b,MAX(h2o_data_all.grp) as grp,MAX(h2o_data_all.other_name) as other_name,MAX(h2o_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(h2o_data_all.line) as line,MAX(h2o_data_all.vrange) as vrange,MAX(h2o_data_all.vpeak) as vpeak,MAX(h2o_data_all.peak) as peak,MAX(h2o_data_all.fwhm) as fwhm,MAX(h2o_data_all.int) as int,MAX(h2o_data_all.rms) as rms,MAX(h2o_data_all.units) as units,MAX(h2o_data_all.units_rms) as units_rms,MAX(h2o_data_all.date_txt) as date_txt,MAX(h2o_data_all.telescope_ref) as telescope_ref,MAX(h2o_data_all.telescope_conf) as telescope_conf,MAX(h2o_data_all.v_step) as v_step,MAX(h2o_data_all.beam) as beam,MAX(h2o_data_all.beam_maj) as beam_maj,MAX(h2o_data_all.beam_min) as beam_min,MAX(h2o_data_all.beam_pa) as beam_pa,MAX(h2o_data_all.ref) as ref,MAX(h2o_data_all.list_ref) as list_ref,MAX(h2o_data_all.ascii) as ascii,MAX(h2o_data_all.url) as url,MAX(h2o_data_all.image) as image,MAX(h2o_data_all.image2) as image2,MAX(h2o_data_all.image3) as image3,MAX(h2o_data_all.descr) as descr,MAX(h2o_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(h2o_data_all.dist) as dist,1 as dist_parallax,MAX(h2o_data_all.date_txt) as date_txt,MAX(line_det) as line_det,MAX(type) as type,MAX(simbad_types_cat) as simbad_types_cat FROM h2o_data_all  LEFT JOIN all_objects_withmet ON h2o_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON h2o_data_all.line=transitions."Line"  WHERE ref ilike 'SHI11' AND detected=true AND hide=false GROUP BY ref

select h2o_data_all.ra_hms,h2o_data_all.dec_dms,h2o_data_all.source_name,h2o_data_all.ra,h2o_data_all.dec,h2o_data_all.l,h2o_data_all.b,h2o_data_all.grp,h2o_data_all.other_name,h2o_data_all.other_desc,h2o_data_all.thermal,h2o_data_all.line,h2o_data_all.vrange,h2o_data_all.vpeak,h2o_data_all.peak,h2o_data_all.fwhm,h2o_data_all.int,h2o_data_all.rms,h2o_data_all.units,h2o_data_all.units_rms,h2o_data_all.date_txt,h2o_data_all.telescope_ref,h2o_data_all.telescope_conf,h2o_data_all.v_step,h2o_data_all.beam,h2o_data_all.beam_maj,h2o_data_all.beam_min,h2o_data_all.beam_pa,h2o_data_all.ref,h2o_data_all.list_ref,h2o_data_all.ascii,h2o_data_all.url,h2o_data_all.image,h2o_data_all.image2,h2o_data_all.image3,h2o_data_all.descr,h2o_data_all.id,h2o_data_all.mjy_flag,h2o_data_all.rms_mjy_flag,h2o_data_all.dist,h2o_data_all.dist_parallax,h2o_data_all.date_txt,line_det,type,simbad_types_cat FROM h2o_data_all   LEFT JOIN all_objects_withmet ON h2o_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON h2o_data_all.line=transitions."Line"  WHERE ref ilike 'SHI11' AND detected=true AND hide=false ORDER BY detected DESC,id

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SHI11 - H2O Maser Motions and the Distance of the Star-Forming Region G192.16-3.84

Interferometry data

View as list of objects

Detection table from Shiozaki et al. (2011)

SHI11 - H₂O Maser Motions and the Distance of the Star-Forming Region G192.16-3.84